#!/usr/bin/env bash
# What a too-small buffer does. Every guide picks 2048; nobody says what happens when
# an application produces more steps than that.
set -uo pipefail
source "$(dirname "$0")/env.sh"

for cap in 2048 16384; do
  "$(dirname "$0")/stop.sh"
  "$JAVA_HOME/bin/java" -Dstartup.tracking=buffering -Dstartup.buffer=$cap \
    -jar "$JAR" > /tmp/buf.log 2>&1 &
  PID=$!
  for _ in $(seq 1 240); do curl -fs -o /dev/null localhost:8080/actuator/health && break; sleep 0.5; done
  ok=$?
  echo "--- capacity $cap ---"
  if grep -q 'Started StartupDiagnosisApplication' /tmp/buf.log; then
    echo -n "  started, recorded steps: "
    curl -s 'localhost:8080/diag/startup?top=1' \
      | python3 -c "import sys,json;print(json.load(sys.stdin)['recordedSteps'])"
  else
    echo "  application did not start. Last lines of the log:"
    grep -E 'ERROR|Exception|Caused by' /tmp/buf.log | head -5 | sed 's/^/    /'
  fi
  kill -9 $PID 2>/dev/null; wait $PID 2>/dev/null
done
true